Merged revisions 277625 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r277625 | tringenbach | 2010-07-16 17:43:39 -0500 (Fri, 16 Jul 2010) | 9 lines
  
  Save and restore AST_FLAG_BRIDGE_HANGUP_DONT on attended transfer.
  
  ast_bridge_call() clears AST_FLAG_BRIDGE_HANGUP_DONT. But during an attended
  transfer, ast_bridge_call() is called for a second bridge on the same channel,
  and it clears that flag, which still needs to get set for when the original
  ast_bridge_call() gets control back and checks it.
  
  Review: https://reviewboard.asterisk.org/r/741
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@277657 65c4cc65-6c06-0410-ace0-fbb531ad65f3